I have a 2011 f350 srw 6.7 with 3.55 I found a 2013 f350 drw 373 for sale new but I tow a 5th wheel 2 times a year , and the other time use for work about 45 k per year . I am getting 18.0 mpg on highway now , if I trade this and get the 2013 drw what could I get mpg as a daily driver thanks

 

Depends upon how you drive it. City/hwy lots of stop and go all sorts of things will bother mpgs.

I have been able to get about 18-19 on mine for extended runs.

My current tank is running about 16.5 with some towing.

 

iafraid that if I buy the dully my mpgs will drop to 16. mpg doesnot sound like a lot but drive 50k a year and it adds up most of my drving is freeway

 

I've got a 2011 drw. I average about 1800 miles a month with about 75% of those miles highway with no towing. Average speed around 75 mph. I average about 13.5 mpg. When I run straight highway I can get about 14.5 mpg running the same speed. There are people reporting 15 plus mpg highway but I think they average around 65 mph on the highway. I just drove from Dallas tx to Broken Bow Ok @ 80 mph and averaged 14.1 mpg. All of my mpg are hand calculated. Depending on your trailer and hitch weight the drw offers a lot more stability especially if you have a blow out on the rear axle. That was the reason I went drw. But I'm not driving crazy miles like some people on the forum.

 

Yeah, I run 65-70 mph..faster speeds will drink more fuel.

 

If it were me I'd keep the SRW.

The only variant to that equation is the pin weight of your 5th wheel loaded and ready for the road.

You will always have a more stable towing platform with a DRW = less roll in turns and the rear ends are stiffer than the SRW's. If you are just running on the overload springs without much squat with your SRW I'd think you would be just fine, minus the rolling.

For daily driving a DRW is a PITA. I used to drive one (2005 CCLB, 6.0). If I was hauling every day like I was then I wouldn't have anything but a DRW. Since I'm not hauling anymore the SRW is more than capable.

You will also get lower axle ratios with the DRW (4.10's, 4.30's) vs the 3.55's or 3.31's (I believe still only available on 18" wheels, not 20's). The axle ratios will affect your mileage - higher ratio = lower mileage. With the 6 speed transmissions in these trucks its not as big of a deal - there are more gears to find the right one when climbing.

If mileage and daily driving is important stick to the SRW. You can get airbags to stiffen up the rear end if you want to, that may help on your stability a bit too.

 

I am in the middle of a 3000 mile trip to pick up my 5th wheel with my new to me 2012 350 drw.
I am getting hand calculated 15.8. Most of the mileage is at 70-75 mph.

My prior 2012 f250 3.31 was getting 17-18 at the same speed.

 

I prefer a DRW for the stability when towing, especially in the wet and high winds.

 

Not good. Get the single rear wheels. I tow a 14,000 5th wheel with a single rear wheel F350 and have not had any problems. Why use the extra 2 tires and that bulgous rear fender???

ken

 

For towing twice a year and 45k empty miles, as long as your trailer isn't overloading the current truck, I'd stay SRW. You'll never see SRW mileage with the dually. I generally see around 15 with mine, but I very rarely run empty highway miles with it, so I don't really know where it would fall. Towing the 8k hillbilly camper, I see around 12-13. I don't commute with, or even drive my truck daily, so the lower mileage and big hips dont bother me. DOT loves pickups around here, specifically with flatbed goosenecks like mine, I was just running too close/ over for the SRW. But now life changed, and we're 5th wheel shopping, and I'm glad have my dually.

 

Meh... I don't see what the big deal is. I think a lot of it is perception and people feeling like the truck is much wider than it actually is. My neighbor won't take his truck if he can avoid it and won't use a drive through. I haven't found one yet that I can't negotiate. If you can get through with your mirrors, the wheel wells will be fine.

The length of my truck is a bigger issue when parking, but that was the same with the SRW I had previously.

 

drw hasn't presented any issues for me...not when you are used to towing 5ers and such that are pretty wide.

I don't do drive thru's though...they get the order wrong.